How do the various smalltalk VMs provide cross-platform graphics for morphic?

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For example, Pharo and Squeak are different implementations of Smalltalk. Are there specific bindings in the smalltalk VM for each platform?

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Kwaku On

Morphic is implemented with Smalltalk in Pharo and Squeak. So there are no bindings to an external graphics library. Though there are some differences the basic API is the same.

There is as well a Morphic implementation in Cuis Smalltalk which aims at a version 3 of Morphic (more).